Method and apparatus for optimizing ue identification

Patent metadata

Field	Value
Publication number	US-2016286442-A1
Application number	US-201315035714-A
Country	US
Kind code	A1
Filing date	Nov 27, 2013
Priority date	Nov 27, 2013
Publication date	Sep 29, 2016
Grant date	—

Abstract

A method and an apparatus in a base station of a cellular radio system for identifying whether user equipment, UE, is in a first UE group or a second UE group. A speed of any UE in the first UE group is higher than a speed of any UE in the second UE group. The method comprises: detecting one or more handover failure events of at least one of the first UE group and the second UE group; determining whether there is any UE misidentified in the first or second UE group based on the one or more handover failure events; and in response to determining that there is a UE misidentified in the first or second UE group, adjusting at least one of the criteria of identifying a UE as in the first UE group and the criteria of identifying a UE as in the second UE group.

First claim

1 . A method in a base station, BS, of a cellular radio system for optimizing criteria of identifying a user equipment, UE, as in a first UE group or a second UE group, wherein a speed of any UE in the first UE group is higher than a speed of any UE in the second UE group, the method comprising:
detecting one or more handover failure events of at least one of the first UE group and the second UE group; determining whether there is any UE misidentified in the first or second UE group based on the one or more handover failure events; and in response to determining that there is a UE misidentified in the first or second UE group, adjusting at least one of the criteria of identifying a UE as in the first UE group and the criteria of identifying a UE as in the second UE group.

2 . The method of claim 1 , wherein after said detecting, the method further comprises:
in response that a predefined number of too-early or too-late handover events of the first UE group or the second UE group are detected, modifying a handover triggering condition for a respective UE group; and wherein said determining comprises: in response that, after a predetermined number of said modifying or after a predetermined period of time of said modifying, the handover triggering condition for the first UE group or the second UE group fails to reach a steady state where the number of detected handover failure events in a respective UE group is below a predefined threshold, determining that a UE is misidentified in the respective UE group.

3 . The method of claim 1 , wherein said determining comprises:
in response that a predefined number of too-early handover events of the first UE group are detected where a difference of signal quality between a target cell and a source cell associated with a respective too-early handover event is larger than a first threshold, determining that a UE is misidentified in the first UE group; or in response that a predefined number of too-late handover events of the second UE group are detected where a difference of signal quality between a target cell and a source cell associated with a respective too-late handover event is smaller than a second threshold, determining that a UE is misidentified in the second UE group.

4 . The method of claim 1 , wherein said determining comprises:
in response that a predefined number of too-early handover events are detected, determining that a UE is misidentified in the first UE group; or in response that a predefined number of too-late handover events are detected, determining that a UE is misidentified in the second UE group.

5 . The method of claim 2 , wherein said adjusting comprises:
in response to determining that a UE is misidentified in the first UE group, upgrading the criteria of identifying a UE as in the first UE group and/or degrading the criteria of identifying a UE as in the second UE group; or in response to determining that a UE is misidentified in the second UE group, degrading the criteria of identifying a UE as in the first UE group and/or upgrading the criteria of identifying a UE as in the second UE group.

6 . The method of claim 5 , wherein the criteria of identifying a UE as in the first UE group or the second UE group are based on Doppler Frequency-Offset Estimation, FOE, wherein a UE is identified as in the first UE group if a Doppler-FOE related parameter of the UE is higher than a third threshold, and a UE is identified as in the second UE group if the Doppler-FOE related parameter is lower than a fourth threshold; and
wherein said degrading the criteria of identifying a UE as in the first UE group comprises decreasing the third threshold, said upgrading the criteria of identifying a UE as in the second UE group comprises decreasing the fourth threshold, said upgrading the criteria of identifying a UE as in the first UE group comprises increasing the third threshold, and said degrading the criteria of identifying a UE as in the second UE group comprises increasing the fourth threshold.

7 . A base station, BS, of a cellular radio system for optimizing criteria of identifying a user equipment, UE, as in a first UE group or a second UE group, wherein a speed of any UE in the first UE group is higher than a speed of any UE in the second UE group, the base station comprising:
a detecting module, configured to detect one or more handover failure events of at least one of the first UE group and the second UE group; a determining module, configured to determine whether there is any UE misidentified in the first or second UE group based on the one or more handover failure events; and an adjusting module, configured to, in response to determining that there is a UE misidentified in the first or second UE group, adjust at least one of the criteria of identifying a UE as in the first UE group and the criteria of identifying a UE as in the second UE group.

8 . The base station of claim 7 , wherein the base station further comprises:
a modifying module, configured to, in response that a predefined number of too-early or too-late handover events of the first UE group or the second UE group are detected, modify a handover triggering condition for a respective UE group; and wherein said determining module is configured to determine whether there is any UE misidentified in the first or second UE group by: in response that, after a predetermined number of said modifying or after a predetermined period of time of said modifying, the handover triggering condition for the first UE group or the second UE group fails to reach a steady state where the number of detected handover failure events in a respective UE group is below a predefined threshold, determining that a UE is misidentified in the respective UE group.

9 . The base station of claim 7 , wherein said determining module is configured to determine whether there is any UE misidentified in the first or second UE group by:
in response that a predefined number of too-early handover events of the first UE group are detected where a difference of signal quality between a target cell and a source cell associated with a respective too-early handover event is larger than a first threshold, determining that a UE is misidentified in the first UE group; or in response that a predefined number of too-late handover events of the second UE group are detected where a difference of signal quality between a target cell and a source cell associated with a respective too-late handover event is smaller than a second threshold, determining that a UE is misidentified in the second UE group.

10 . The base station of claim 7 , wherein said determining module is configured to determine whether there is any UE misidentified in the first or second UE group by:
in response that a predefined number of too-early handover events are detected, determining that a UE is misidentified in the first UE group; or in response that a predefined number of too-late handover events are detected, determining that a UE is misidentified in the second UE group.

11 . The base station of claim 8 , wherein said adjusting module is configured to adjust at least one of the criteria of identifying a UE as in the first UE group and the criteria of identifying a UE as in the second UE group by:
in response to determining that a UE is misidentified in the first UE group, upgrading the criteria of identifying a UE as in the first UE group and/or degrading the criteria of identifying a UE as in the second UE group; and in response to determining that a UE is misidentified in the second UE group, degrading the criteria of identifying a UE as in the first UE group and/or upgrading the criteria of identifying a UE as in the second UE

Assignees

• Ericsson Telefon Ab L M

Inventors

• Huang Min
• Zhang Yipeng
• Xiao Lei

Classifications

• H04W36/16

  Performing reselection for specific purposes · CPC title

• H04W36/0083 Primary

  Determination of parameters used for hand-off, e.g. generation or modification of neighbour cell lists · CPC title

• H04W36/324

  by mobility data, e.g. speed data · CPC title

• H04W36/00837 Primary

  Determination of triggering parameters for hand-off · CPC title